Whether you're a curious developer or a user waiting to get their hands on the Yosemite public beta, check out Ars Technica's guide on creating a hard drive partition. Keep your main computer usable and test all the things.
256GB USB Turbo 3.0as low as $70.00
My Passport Ultra BMWV0020BBK-NESN 2 TB External H...as low as $120.00
Black 3D Blu-ray Disc Player - BD-H6500/ZAas low as $118.00
XLR8 240 GB 2.5" Internal Solid State Drive - Reta...as low as $140.00
My Passport Ultra BZFP0010BBK-NESN Portable Extern...as low as $70.00
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